Architect Vincent Callebaut is the brainchild behind 'The 5 Farming Bridges', which features 3D-printed housing units in the form of articulated spiders over the Tigris River in Mosul, IraqThe concept was a winning project of the Rifat Chadirji Prize Competition, 'Rebuilding Iraq's Liberated Areas: Mosul's Housing'Five 3D printers could construct 30 houses per day, or nearly 55,000 housing units in five years spread over the five bridges crossing the Tigris

The bridges and the housing built atop them would be constructed using building debris and rubble found around the cityMosul, Iraq's second city, was retaken from IS in July after a massive months-long offensive that left the majority of the city destroyed and hundreds of thousands left without a place to live.

Across the city, 10,000 buildings were damaged over the course of the war, the large majority in western Mosul, the scene of the most intense artillery, airstrikes and fighting during the past five months.

All five of the city's bridges spanning the Tigris River were damaged and deemed unusable during the offensive.